At eleven on Friday night, Lu Chuan stepped out of the office tower. The only lights left on along the whole street were at the convenience store. He'd just finished revising the seventeenth version of a proposal for the client, and his dinner had long since gone cold. The microwave at the convenience store beeped. Carrying his boxed meal to the register, he paid and glanced at his phone. Bank balance: 1,399.86 yuan. Lu Chuan stopped in his tracks. After paying rent last night, he'd clearly worked out that he had only 1,386 yuan left in his account. The extra 13.86 yuan was exactly one percent of 1,386. His first thought was that it must be a refund, but his transaction history was spotless. There was no transfer...